Packaging technology is a key factor in fiber Bragg grating (FBG) sensing, which can greatly affect the sensing performance of FBG sensors. In this paper, a pre-stressed packaging method for FBG sensors is proposed. The method enables the pre-stress applied on the FBG to be continuously and accurately adjusted when the FBG sensor is packaged, thereby ensuring the stability of the pre-stress. In order to implement the method, an instrument is designed and fabricated as well. The proposed method is demonstrated through some experiments, experimental researches indicate that using the proposed method, the spectrums of the fourteen packaged FBG sensors have no chirping nor broadening the spectral 3 dB bandwidth. The average temperature-dependent sensitivity coefficient of fourteen sensors is 2.03 × 10⁻⁵/℃, the relative error is 1.7%, and the average linearity is better than 0.999. So, the proposed pre-stressed packaging method has advantages of great stability, good repeatability, easy operation and low cost.

封装技术是光纤布拉格光栅 (FBG) 传感的关键因素，它可以极大地影响 FBG 传感器的传感性能。本文提出了一种光纤光栅传感器的预应力封装方法。该方法使得FBG传感器在封装时能够连续准确地调整施加在FBG上的预应力，从而保证预应力的稳定性。为了实施该方法，还设计并制造了仪器。通过一些实验证明了所提出的方法，实验研究表明，使用所提出的方法，十四个封装的FBG传感器的频谱没有啁啾，也没有拓宽频谱3 dB带宽。14 个传感器的平均温度相关灵敏度系数为 2.03 × 10 ^-5/℃，相对误差为1.7%，平均线性优于0.999。因此，所提出的预应力封装方法具有稳定性好、重复性好、操作简单、成本低等优点。